The London Lettings Specialist. Offering a ground-breaking flat fee to Landlords, Csense Limited, established in 2000, provide the sort of Lettings and Management service Landlords and Tenants both want and need, for a more reasonable price, whilst providing exceptionally high levels of service. As members of the National Approved Lettings Scheme and the Residential Landlords Association, we offer professional assurance of guaranteed customer service and pride ourselves in exceeding the codes of conduct set out by these bodies.